US8744279B2 - Adaptive PMD equalizer and implementation - Google Patents
Adaptive PMD equalizer and implementation Download PDFInfo
- Publication number
- US8744279B2 US8744279B2 US13/205,437 US201113205437A US8744279B2 US 8744279 B2 US8744279 B2 US 8744279B2 US 201113205437 A US201113205437 A US 201113205437A US 8744279 B2 US8744279 B2 US 8744279B2
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- tap
- error
- fir
- fir filter
- generation module
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2569—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to polarisation mode dispersion [PMD]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/613—Coherent receivers including phase diversity, e.g., having in-phase and quadrature branches, as in QPSK coherent receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
- H04B10/6971—Arrangements for reducing noise and distortion using equalisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6166—Polarisation demultiplexing, tracking or alignment of orthogonal polarisation components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
- H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure
Abstract
Description
-
- Where:
- n is the sample index (lower number is earlier in time),
- i is index variable,
- Out is the output sample where the first subscript shows the output channel and second subscript is the sample index,
- In is the input sample where the first subscript shows the input channel and second subscript is the sample index,
- and T is the set of filter taps where the first subscript shows which of the 16 filters and the second subscript is the tap index assuming a 16-tap filter where
index 0 is the center tap. Of course, as will be readily recognized by one skilled in the art, C or RTL indexing of the taps may be used, in which case the taps would be numbered from 0 to 15 with 7 being the center tap. The example ofFIG. 6 utilizes real filters, as opposed to complex filters.
T HI-to-HI,i,n =T HI-to-HI,i,n−1+(β−(OutHI,n 2+OutHQ,n 2))×OutHi,n+InHI,n+i×μ)
T HI2HI,i,n =T HI2HI,i,n−1+sign(β−(OutHI,n 2+OutHQ,n 2))×OutHi,n+InHI,n+i×μ)
-
- Where
- Out2 is the squared on-time output sample where the first subscript shows the output channel and second subscript is the sample index,
- β is desired threshold (squared radius) which CMA is driving towards,
- μ is a gain factor that affects the speed and stability of CMA's convergence,
- sign(.) calculates the sign of the operand,
- and rest of the variables have the same meaning as described with respect to the real FIR filters 600-675 of
FIG. 6 .
Claims (25)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/205,437 US8744279B2 (en) | 2011-01-22 | 2011-08-08 | Adaptive PMD equalizer and implementation |
Applications Claiming Priority (2)
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---|---|---|---|
US201161435278P | 2011-01-22 | 2011-01-22 | |
US13/205,437 US8744279B2 (en) | 2011-01-22 | 2011-08-08 | Adaptive PMD equalizer and implementation |
Publications (2)
Publication Number | Publication Date |
---|---|
US20120189319A1 US20120189319A1 (en) | 2012-07-26 |
US8744279B2 true US8744279B2 (en) | 2014-06-03 |
Family
ID=46544241
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US13/205,435 Active 2032-02-24 US8705664B2 (en) | 2011-01-22 | 2011-08-08 | Soft-input generation for soft-decision FEC decoding |
US13/205,437 Active 2032-09-21 US8744279B2 (en) | 2011-01-22 | 2011-08-08 | Adaptive PMD equalizer and implementation |
US13/205,441 Active 2031-10-19 US8687974B2 (en) | 2011-01-22 | 2011-08-08 | Skew compensation and tracking in communications systems |
US13/356,159 Active 2032-05-05 US8639126B1 (en) | 2011-01-22 | 2012-01-23 | Coarse frequency offset estimation and correction for high-speed optical communications |
US13/356,177 Active 2032-08-18 US8682180B1 (en) | 2011-01-22 | 2012-01-23 | Interpolator for high-rate optical communications |
US13/356,192 Active 2032-05-01 US8705977B1 (en) | 2011-01-22 | 2012-01-23 | Equalizer tap correction and reseeding |
US14/178,986 Active US8886051B2 (en) | 2011-01-22 | 2014-02-12 | Skew compensation and tracking in communications systems |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US13/205,435 Active 2032-02-24 US8705664B2 (en) | 2011-01-22 | 2011-08-08 | Soft-input generation for soft-decision FEC decoding |
Family Applications After (5)
Application Number | Title | Priority Date | Filing Date |
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US13/205,441 Active 2031-10-19 US8687974B2 (en) | 2011-01-22 | 2011-08-08 | Skew compensation and tracking in communications systems |
US13/356,159 Active 2032-05-05 US8639126B1 (en) | 2011-01-22 | 2012-01-23 | Coarse frequency offset estimation and correction for high-speed optical communications |
US13/356,177 Active 2032-08-18 US8682180B1 (en) | 2011-01-22 | 2012-01-23 | Interpolator for high-rate optical communications |
US13/356,192 Active 2032-05-01 US8705977B1 (en) | 2011-01-22 | 2012-01-23 | Equalizer tap correction and reseeding |
US14/178,986 Active US8886051B2 (en) | 2011-01-22 | 2014-02-12 | Skew compensation and tracking in communications systems |
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US (7) | US8705664B2 (en) |
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US8639126B1 (en) | 2014-01-28 |
US8687974B2 (en) | 2014-04-01 |
US8886051B2 (en) | 2014-11-11 |
US20120189320A1 (en) | 2012-07-26 |
US8705664B2 (en) | 2014-04-22 |
US20140161470A1 (en) | 2014-06-12 |
US20120189319A1 (en) | 2012-07-26 |
US8705977B1 (en) | 2014-04-22 |
US8682180B1 (en) | 2014-03-25 |
US20120189324A1 (en) | 2012-07-26 |
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